This issue has variants.
3 letters of comment by Kevin Barron, James Dysart, Bob Kowalski.
Total of 7 one-page and 1 two-page and advertisements for: Cap'n Crunch Crunch Berries (snack, QOC), Dave's Comics (mail order, Dave's Comics), Toastettes (snack, Nabisco), Win a $3,500 Spider-Man Guitar! (contest, Marvel/Gibson), Marvel Milk Maniacs (milk, Milk Promotion Board, 2 pages), Oreo Stacking Contest (contest, oreo.com), Kool-Aid (soft drink, Kraft Foods), 3 Musketeers (candy, Mars).
Promo insert containing of two Marvel Milk trading cards with artwork by Andy Kubert.
8 pages mini-sized booklet inserted in comic book. 6 pages of comic story "Fizz Goes Flat!", plus cover illustration and back cover ad. This is issue #4. The corner box on the cover says "Marvel Custom Comics".